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Recent content by imijoon

  1. I

    Problem in measuring Capacitor

    Thanks all, My capacitor is Yageo 22pf NPO. So how can I measure it? It's too important for me because I want to validate if it's original or fake.
  2. I

    Problem in measuring Capacitor

    I use Kelvin clip to measuring. Is it possible that problem is from that? Is it solved if I use 2 wire clip?
  3. I

    Problem in measuring Capacitor

    Hi everyone, I have a strange problem in measuring NPO MLCC capacitor. I want to measure a NPO capacitor and according to datasheet I should measure the capacitance and DF in 1Mhz,1Vrms condition. but My lcr-meter is GW-instek LCR-819 and it can measure up to 100khz. when I measure C and D in...
  4. I

    Diode IFSM tester up to 300Amp

    Exactly, but I can use thick and short wires to reduce the connections resistance. You said forward drop voltage of diode is couple of volts. Isn't it about 0.9v ?
  5. I

    Diode IFSM tester up to 300Amp

    I will reset it after each test by a negative pulse. A mechanism which there is a switch and a resistor in the output exactly in parallel with DUT. A negative pulse goes through primary and then secondary and then output resistor.
  6. I

    Diode IFSM tester up to 300Amp

    Hi, I want to make a tester to test Diode IFSM parameter up to 300Amp. To know if my diode can pass this test according to it's datasheet or not. My designed circuit is attached below the post. I apply a single 20ms square pulse to MOC3063 triac driver input. It has a zero cross detection so...
  7. I

    Gain Bandwidth (really get confused)

    Thanks chuckey but I didn't get my answer clearly. which one is correct ? (GBP=A0*fc) or (GBP=A*fc) of (GBP= (any A in slope)*(it's frequency))
  8. I

    Gain Bandwidth (really get confused)

    Hi all, I want to measure my op-amp GBP(fT) . I have a non inverting op-amp amplifier circuit with the gain of 10 . I increase the frequency until the gain becomes 7.07 . Now the frequency is 85khz (-3db frequency) . what is the formula for GBP. according to the bottom picture it should be ((...
  9. I

    Help me about drive an LCD with AVR

    Hi all , I needed a small 5 digit LCD but I couldn't find it . I bought a counter (like picture below) and opened it . I want to drive the LCD but I don't know how to do it . I attached the counter and it's internal board . the Via in internal board is connected to the LCD . please help me .
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